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Answer Wiki. The ionic charge of oxygen is -2. You can tell because oxygen is in group number 6, so it has 6 valence electrons. Since it needs 2 more electrons to become neutral with a full outer shell of 8 electrons, its charge is -2 (since adding electrons gives a negative charge).
The sulfur atom is in the +6 oxidation state while the four oxygen atoms are each in the â2 state. The sulfate ion carries a negative two charge and is the conjugate base of the bisulfate (or hydrogen sulfate) ion, HSO 4 â , which is the conjugate base of H 2SO 4, sulfuric acid.he sulfur atom is in the +6 oxidation state while the four oxygen atoms are each in the â2 state. The sulfate ion carries a negative two charge and is the conjugate base of the bisulfate (or hydrogen sulfate) ion, HSO 4 â , which is the conjugate base of H 2SO 4, sulfuric acid.